20445615503500 has 384 divisors, whose sum is σ = 53596986992640. Its totient is φ = 6725752704000.

The previous prime is 20445615503483. The next prime is 20445615503513. The reversal of 20445615503500 is 530551654402.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1473338562 + ... + 1473352438.

It is an arithmetic number, because the mean of its divisors is an integer number (139575486960).

Almost surely, 2^{20445615503500} is an apocalyptic number.

20445615503500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20445615503500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26798493496320).

20445615503500 is an abundant number, since it is smaller than the sum of its proper divisors (33151371489140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20445615503500 is a wasteful number, since it uses less digits than its factorization.

20445615503500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14562 (or 14550 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 40.

The spelling of 20445615503500 in words is "twenty trillion, four hundred forty-five billion, six hundred fifteen million, five hundred three thousand, five hundred".